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fix #2659

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2019-10-25 09:13:18 -07:00
parent a8049c7feb
commit 64dd4e1c83
6 changed files with 58 additions and 27 deletions
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18
src/nlsat/nlsat_explain.cpp
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@ -312,6 +312,7 @@ namespace nlsat {
polynomial_ref lc(m_pm);
polynomial_ref reduct(m_pm);
while (true) {
TRACE("nlsat_explain", tout << "elim vanishing x" << x << " k:" << k << " " << p << "\n";);
if (is_const(p))
return;
if (k == 0) {
@ -320,9 +321,22 @@ namespace nlsat {
SASSERT(x != null_var);
k = degree(p, x);
}
if (m_pm.nonzero_const_coeff(p, x, k))
#if 0
anum const & x_val = m_assignment.value(x);
if (m_am.is_zero(x_val)) {
// add_zero_assumption(lc);
lc = m_pm.coeff(p, x, k, reduct);
k--;
p = reduct;
continue;
}
#endif
if (m_pm.nonzero_const_coeff(p, x, k)) {
TRACE("nlsat_explain", tout << "nonzero const x" << x << "\n";);
return; // lc is a nonzero constant
}
lc = m_pm.coeff(p, x, k, reduct);
TRACE("nlsat_explain", tout << "lc: " << lc << " reduct: " << reduct << "\n";);
if (!is_zero(lc)) {
if (sign(lc) != polynomial::sign_zero)
return;
@ -630,7 +644,7 @@ namespace nlsat {
for (unsigned i = 0; i < sz; i++) {
s = S.get(i);
TRACE("nlsat_explain", tout << "processing psc(" << i << ")\n"; display(tout, s); tout << "\n";);
TRACE("nlsat_explain", display(tout << "processing psc(" << i << ")\n", s) << "\n";);
if (is_zero(s)) {
TRACE("nlsat_explain", tout << "skipping psc is the zero polynomial\n";);
continue;